android AlertDialog.Builder
AlertDialog的構(gòu)造方法全部是Protected的，所以不能直接通過new一個AlertDialog來創(chuàng)建出一個AlertDialog。
要創(chuàng)建一個AlertDialog，就要用到AlertDialog.Builder中的create()方法。
使用AlertDialog.Builder創(chuàng)建對話框需要了解以下幾個方法：
setTitle ：為對話框設(shè)置標(biāo)題
setIcon ：為對話框設(shè)置圖標(biāo)
setMessage：為對話框設(shè)置內(nèi)容
setView ： 給對話框設(shè)置自定義樣式
setItems ：設(shè)置對話框要顯示的一個list，一般用于顯示幾個命令時
setMultiChoiceItems ：用來設(shè)置對話框顯示一系列的復(fù)選框
setNeutralButton??? ：普通按鈕
setPositiveButton?? ：給對話框添加"Yes"按鈕
setNegativeButton ：對話框添加"No"按鈕
create ： 創(chuàng)建對話框
show ：顯示對話框
一、簡單的AlertDialog
下面，創(chuàng)建一個簡單的ALertDialog并顯示它：
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??????? Dialog alertDialog = new AlertDialog.Builder(this).?
??????????????? setTitle("對話框的標(biāo)題").?
??????????????? setMessage("對話框的內(nèi)容").?
??????????????? setIcon(R.drawable.ic_launcher).?
??????????????? create();?
??????? alertDialog.show();?
???
運行結(jié)果如下：
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二、帶按鈕的AlertDialog
上面的例子很簡單，下面我們在這個AlertDialog上面加幾個Button，實現(xiàn)刪除操作的提示對話框
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??????? Dialog alertDialog = new AlertDialog.Builder(this).?
??????????????? setTitle("確定刪除？").?
??????????????? setMessage("您確定刪除該條信息嗎？").?
??????????????? setIcon(R.drawable.ic_launcher).?
??????????????? setPositiveButton("確定", new DialogInterface.OnClickListener() {?
?????????????????????
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which) {?
??????????????????????? // TODO Auto-generated method stub??
??????????????????? }?
??????????????? }).?
??????????????? setNegativeButton("取消", new DialogInterface.OnClickListener() {?
?????????????????????
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which) {?
??????????????????????? // TODO Auto-generated method stub??
??????????????????? }?
??????????????? }).?
??????????????? setNeutralButton("查看詳情", new DialogInterface.OnClickListener() {?
?????????????????????
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which) {?
??????????????????????? // TODO Auto-generated method stub??
??????????????????? }?
??????????????? }).?
??????????????? create();?
??????? alertDialog.show();?
??? 在這個例子中，我們定義了三個按鈕，分別是"Yes"按鈕，"No"按鈕以及一個普通按鈕，每個按鈕都有onClick事件，TODO的地方可以放點了按鈕之后想要做的一些處理
看一下運行結(jié)果：
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可以看到三個按鈕添加到了AlertDialog上，三個沒有添加事件處理的按鈕，點了只是關(guān)閉對話框，沒有任何其他操作。
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三、類似ListView的AlertDialog
用setItems(CharSequence[] items, final OnClickListener listener)方法來實現(xiàn)類似ListView的AlertDialog
第一個參數(shù)是要顯示的數(shù)據(jù)的數(shù)組，第二個參數(shù)是點擊某個item的觸發(fā)事件
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??????? final String[] arrayFruit = new String[] { "蘋果", "橘子", "草莓", "香蕉" };?
?
??????? Dialog alertDialog = new AlertDialog.Builder(this).?
??????????????? setTitle("你喜歡吃哪種水果？").?
??????????????? setIcon(R.drawable.ic_launcher)?
??????????????? .setItems(arrayFruit, new DialogInterface.OnClickListener() {?
??
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which) {?
??????????????????????? Toast.makeText(Dialog_AlertDialogDemoActivity.this, arrayFruit[which], Toast.LENGTH_SHORT).show();?
??????????????????? }?
??????????????? }).?
??????????????? setNegativeButton("取消", new DialogInterface.OnClickListener() {?
?
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which) {?
??????????????????????? // TODO Auto-generated method stub??
??????????????????? }?
??????????????? }).?
??????????????? create();?
??????? alertDialog.show();?
???運行結(jié)果如下：
?
?
?
四、類似RadioButton的AlertDialog
用setSingleChoiceItems(CharSequence[] items, int checkedItem, final OnClickListener listener)方法來實現(xiàn)類似RadioButton的AlertDialog
第一個參數(shù)是要顯示的數(shù)據(jù)的數(shù)組，第二個參數(shù)是初始值（初始被選中的item），第三個參數(shù)是點擊某個item的觸發(fā)事件
在這個例子里面我們設(shè)了一個selectedFruitIndex用來記住選中的item的index
?????
??? private int selectedFruitIndex = 0;?
?????
?????
??????? final String[] arrayFruit = new String[] { "蘋果", "橘子", "草莓", "香蕉" };?
?
??????? Dialog alertDialog = new AlertDialog.Builder(this).?
??????????????? setTitle("你喜歡吃哪種水果？").?
??????????????? setIcon(R.drawable.ic_launcher)?
??????????????? .setSingleChoiceItems(arrayFruit, 0, new DialogInterface.OnClickListener() {?
??
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which) {?
??????????????????????? selectedFruitIndex = which;?
??????????????????? }?
??????????????? }).?
??????????????? setPositiveButton("確認(rèn)", new DialogInterface.OnClickListener() {?
?
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which) {?
??????????????????????? Toast.makeText(Dialog_AlertDialogDemoActivity.this, arrayFruit[selectedFruitIndex], Toast.LENGTH_SHORT).show();?
??????????????????? }?
??????????????? }).?
??????????????? setNegativeButton("取消", new DialogInterface.OnClickListener() {?
?
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which) {?
??????????????????????? // TODO Auto-generated method stub??
??????????????????? }?
??????????????? }).?
??????????????? create();?
??????? alertDialog.show();?
???
運行結(jié)果如下：
?
?
五、類似CheckBox的AlertDialog
用setMultiChoiceItems(CharSequence[] items, boolean[] checkedItems, final OnMultiChoiceClickListener listener)方法來實現(xiàn)類似CheckBox的AlertDialog
第一個參數(shù)是要顯示的數(shù)據(jù)的數(shù)組，第二個參數(shù)是選中狀態(tài)的數(shù)組，第三個參數(shù)是點擊某個item的觸發(fā)事件
?
??????? final String[] arrayFruit = new String[] { "蘋果", "橘子", "草莓", "香蕉" };?
??????? final boolean[] arrayFruitSelected = new boolean[] {true, true, false, false};?
?
??????? Dialog alertDialog = new AlertDialog.Builder(this).?
??????????????? setTitle("你喜歡吃哪種水果？").?
??????????????? setIcon(R.drawable.ic_launcher)?
??????????????? .setMultiChoiceItems(arrayFruit, arrayFruitSelected, new DialogInterface.OnMultiChoiceClickListener() {?
?????????????????????
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which, boolean isChecked) {?
??????????????????????? arrayFruitSelected[which] = isChecked;?
??????????????????? }?
??????????????? }).?
??????????????? setPositiveButton("確認(rèn)", new DialogInterface.OnClickListener() {?
?
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which) {?
??????????????????????? StringBuilder stringBuilder = new StringBuilder();?
??????????????????????? for (int i = 0; i < arrayFruitSelected.length; i++) {?
??????????????????????????? if (arrayFruitSelected[i] == true)?
??????????????????????????? {?
??????????????????????????????? stringBuilder.append(arrayFruit[i] + "、");?
??????????????????????????? }?
??????????????????????? }?
??????????????????????? Toast.makeText(Dialog_AlertDialogDemoActivity.this, stringBuilder.toString(), Toast.LENGTH_SHORT).show();?
??????????????????? }?
??????????????? }).?
??????????????? setNegativeButton("取消", new DialogInterface.OnClickListener() {?
?
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which) {?
??????????????????????? // TODO Auto-generated method stub??
??????????????????? }?
??????????????? }).?
??????????????? create();?
??????? alertDialog.show();?
??? 運行結(jié)果如下：
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?
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六、自定義View的AlertDialog
有時候我們不能滿足系統(tǒng)自帶的AlertDialog風(fēng)格，就比如說我們要實現(xiàn)一個Login畫面，有用戶名和密碼，這時我們就要用到自定義View的AlertDialog
先創(chuàng)建Login畫面的布局文件
[html] <?xml version="1.0" encoding="utf-8"?>?
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"?
??? android:layout_width="fill_parent"?
??? android:layout_height="fill_parent"?
??? android:orientation="vertical" >?
?
??? <LinearLayout?
??????? android:layout_width="fill_parent"?
??????? android:layout_height="wrap_content"?
??????? android:gravity="center" >?
?
??????? <TextView?
??????????? android:layout_width="0dip"?
??????????? android:layout_height="wrap_content"?
??????????? android:layout_weight="1"?
??????????? android:text="@string/user" />?
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??????? <EditText?
??????????? android:layout_width="0dip"?
??????????? android:layout_height="wrap_content"?
??????????? android:layout_weight="1" />?
??? </LinearLayout>?
?
??? <LinearLayout?
??????? android:layout_width="fill_parent"?
??????? android:layout_height="wrap_content"?
??????? android:gravity="center" >?
?
??????? <TextView?
??????????? android:layout_width="0dip"?
??????????? android:layout_height="wrap_content"?
??????????? android:layout_weight="1"?
??????????? android:text="@string/passward" />?
?
??????? <EditText?
??????????? android:layout_width="0dip"?
??????????? android:layout_height="wrap_content"?
??????????? android:layout_weight="1" />?
??? </LinearLayout>?
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</LinearLayout>?
然后在Activity里面把Login畫面的布局文件添加到AlertDialog上
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??????? // 取得自定義View??
??????? LayoutInflater layoutInflater = LayoutInflater.from(this);?
??????? View myLoginView = layoutInflater.inflate(R.layout.login, null);?
?????????
??????? Dialog alertDialog = new AlertDialog.Builder(this).?
??????????????? setTitle("用戶登錄").?
??????????????? setIcon(R.drawable.ic_launcher).?
??????????????? setView(myLoginView).?
??????????????? setPositiveButton("登錄", new DialogInterface.OnClickListener() {?
?
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which) {?
??????????????????????? // TODO Auto-generated method stub??
??????????????????? }?
??????????????? }).?
??????????????? setNegativeButton("取消", new DialogInterface.OnClickListener() {?
?
??????????????????? @Override?
??????????????????? public void onClick(DialogInterface dialog, int which) {?
??????????????????????? // TODO Auto-generated method stub??
??????????????????? }?
??????????????? }).?
??????????????? create();?
??????? alertDialog.show();?
???運行結(jié)果如下：
?
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